Signed by itself. At 04:20 Beijing time this morning, one transaction carrying 50 EIP7702 authorizations was signed by a Binance hot wallet’s own private key. About three minutes later, the wallet was swept. Across three chains, roughly $5.8B at this morning’s prices. The Bitcoin portion is not yet confirmed by Binance. No contract bug has been seen onchain. The problem sits in the signing step. Our onchain recap: how the money moved, what is now frozen, and the one question every exchange sh